UML24 — composite tags

Are composite tag definitions allowed?

A Stereotype is a kind of Class and the semantics of a Property defined on a Stereotype is the same as
that of a Property defined on a Class. Therefore, a Stereotype Property can have composite aggregation.
The value of a composite Stereotype Property will be owned by an instance of such Stereotype. The type
of such Property cannot be a Stereotype (since Stereotypes are owned by their Extensions) or a metaclass
(since instances of metaclasses are owned by other instantances of metaclasses); however, the type of such
Property can be a Class defined in the Profile or a DataType defined in the Profile or accessible via import
or via the Profile’s metamodel reference.